Low severity

Lice

Lice are host-specific parasites — Werneckiella (Bovicola) equi or Haematopinus asini — not ringworm, not rain rot, not sweet-itch, and not ordinary dandruff. They can look like itching, a moth-eaten mane, or nits on the hair. A photograph cannot diagnose lice. A still cannot tell lice from dandruff, dirt, sweet-itch, or rain-rot. Diagnosis is a vet exam, often finding lice or nits on the hair. The skin scan is a first look at the coat and mane, not a verdict that your horse has lice, and there is no lice scanner.

Symptoms to watch for

Itching, rubbing, or a moth-eaten mane and tail

Nits (eggs) glued to hair shafts, often at the base of the mane or on the coat

A dull, staring, or patchy coat that can look like dandruff or dirt

More than one horse on the yard with the same pattern of itching or moth-eaten mane

A horse that rubs the mane, neck, or flanks, especially in winter or when coats are long

A change in itching or coat pattern is a reason to book a vet, not a photo verdict

Common causes

Host-specific equine lice — Werneckiella (Bovicola) equi (chewing lice) or Haematopinus asini (sucking lice) — not ringworm, not rain rot, not sweet-itch, and not ordinary dandruff
Close contact or shared brushes, rugs, or tack that move lice or nits from horse to horse
Winter coats, close housing, or a horse that is already run-down — the setting is a clue, not a diagnosis
Not ringworm (fungal), not rain rot (bacterial), not sweet-itch (insect hypersensitivity), and not ordinary dandruff — a still cannot tell lice from dandruff, dirt, sweet-itch, or rain-rot, and those need a vet

Prevention

Do not share brushes, rugs, or tack between an affected horse and the rest of the yard
Watch the mane and coat for itching, moth-eaten hair, or nits, and book a vet rather than waiting for a photo guess
Do not start an insecticide or louse powder from a photo, a web article, or a scan result
Do not treat a photo, nits, or a scan result as a diagnosis
Skin photos can help you and your vet look at the coat and mane — they do not confirm or rule out lice, and they cannot tell lice from dandruff, dirt, sweet-itch, or rain-rot

What to do

1
Book a vet visit if you find itching, a moth-eaten mane, or nits on the hair. Diagnosis is a vet exam, often finding lice or nits on the hair — not a photograph.
2
Photograph the coat and mane in good light and keep it on the horse's record so you and the vet can see change over time — a first look to share, not a diagnosis.
3
Do not share brushes, rugs, or tack, and do not start an insecticide from a photo guess — a still cannot tell lice from dandruff, dirt, sweet-itch, or rain-rot.
4
Use a skin scan only as a first look at the coat and mane to share, not as a lice test. There is no lice scanner.
5
If lice are confirmed, follow the plan your vet prescribes. Do not start a treatment protocol from a photo.
6
Keep the vet on the same page. Share what you see; do not treat a photo as a verdict.

When to call the vet

Pick up the phone if…

Schedule a vet visit if you find itching, a moth-eaten mane, or nits on the hair, especially if more than one horse is affected. Call sooner if the horse is dull, off feed, or losing condition. A photograph cannot diagnose lice. A still cannot tell lice from dandruff, dirt, sweet-itch, or rain-rot. Diagnosis is a vet exam, often finding lice or nits on the hair. Lice are host-specific parasites — not ringworm, not rain rot, not sweet-itch, and not ordinary dandruff. The skin scan is a first look at the coat and mane, not a verdict, and there is no lice scanner.

Get a first look at the coat and mane

Scan the skin in HorseCare. 5 free scans this month, then Pro.

Scan the skin

5 free scans this month, then Pro. Scans run in the HorseCare app.

Educational content only. Not a substitute for veterinary advice.